Sewing machine bobbin-case



Aug@ 20p 1940 KARLE; ZZAYS SEWING MACHINE BoBBIN-CASE Filed July 13, 1959 g] x WCA/VTM @1/Tim Karla .55 providdwithf a recess' I4 of rectangular outline Patented Aug. 20, 1,940

.UNITED STATE SEWING MACHINE BOBBlN-CASE f Jolm D. Karle, Roselle The Singer Manufacturing Company,

Park, N. J., assignor to Elizabeth, N. J., a corporation of New Jersey Application July 13, 1939, Serial No. 284,181 io claims.. (ci. 11a-231') This invention'relates to sewing machine bobbin-cases, more .particularly of the two-part'type e I f formingthe subject of my copending U. S'.I patent application, Serial No. 263,318, filed Mar. 22, 1939. In -th'e two-part bobbin-case disclosed'in my said copending application there is a latch-lever which has near its free lend a lateral extension formed with a rib adapted to snap under a keeperspring to retain the latch-lever in closed position. The present invention has for an object, the eliminatiomof the keeper-spring and the lateral keeper extension onthe latch-lever. A further object of the invention is to provide the latchlever with means to close it and retain it closed, said means being so contrived as not to encroach upon the bobbin cavity or impede the passage of needleloops exteriorly over the bobbin-case. With the above and-other objects in view, as will hereinafter appear, the invention comprises the devices,xcombinations, and arrangements of parts hereinafter set forth and illustrated in the l accompanying drawing of a preferred embodiment of the invention, Ifrom which the4 several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art. In the accompanying drawing, Fig. 1 is a'front face view of a bobbin-case embodying the invention. Fig. 2` is a perspective view of the basesec-y tion of thebobbin-case. Fig. 3 is afvdiametrical section on the line 3 4, Fig. 1.v Fig. ,4 is a metrical section of the cap-section only onjthe line 4-4, Fig. 1. Fig. 5 is a face view of agape, 7-

section embodying the invention in modified form,

and Fig.6 is a diametricalsection on 3 8, Fig 5.

The

" scribed, constructed substantially in accordance., with the disclosure of my said copending appli@- cation. It comprises a cup-shaped base section" I having the axial arbor post I notched or-undercut at 4 to receive the locking tongue l of the latch-lever lvwhich is pivoted on the pin 1 in the tubular axial bobbin-supporting arbor comprises the circular end head Il which carries. the tubular arbor 8 and is cut-away or apertured L toreceive the latch-lever arm i substantially be- ,tweenth'e planes of its inner and outer faces, I2

and Il, respectively, when the latch-arm l is inv closed or, latehing position.. 4 In the'form ofthe invention shown in Figs. 1, 2, 3 and 4,' the end head I0 of the cap-section l is bbbxn-case is, except as nereinsfrfdeperipheral hook-bearing rib 2 and 3v of the cap-section i y of the bobbincaso. The cap-section 9 further to receive the coiled wire torsion-spring I5, the end leg I6 of which is received in the hole I1 in the latch-arm Ii and urges the latter from open position, shown in dotted lines in Fig. 3, to closed or full line position. The other end 1`eg I8 of the 5 spring .I5 rests in the groove I9 in the end head I0. Passing through the spring I5 is the arborpin'` 20 which is parallel to and between the planes of the inner and outer en'd head faces I2, I3. At its outer end the arbor-pin 20 is provided, with a 10 lateral extension 2I facilitating its removal to rel, lease the spring I5 forreplacement purposes. Itl will be observed that the spring I5 does not .en-

` croach upon the bobbin-receiving space within the bobbin-case, nor does it project from the outer 15 face of the Iend head II) 'to impede the f ree passage of needle-thread loops about the bobbin-case.

In the lmodification of the invention shown in Figs'. 5 andG, the end head I'Il of the bobbin-case is recessed at 22 to receive the leaf-spring 23 20 which is secured in the recess 22 by the screw 24 andis receivedv at its free end in the hole 25 `in the'latch-arm 6 and urges the latter from open lor dotted line position, Fig. 6, to closedor full line position.

' Like the coiled wire-spring I5, the leaf-spring 23 does not encroach upon the bobbin cavity within the bobbin-case nor project outwardly of the outer face of the bobbin-case. It doesA not impede thel freepassage of .needlethread loops about 30 th bobbin-case.

I The foregoing specification is to be read in an illustrative sense and not in limitation of the in- 4 vention which 'isy susceptibleof embodiment in.

arious other forms than `those illustrated, within 35 `the spirit and scope of the invention.

Having thusset forth the nature of the invention, what I claim herein is:

, 1. A sewing machinebobbin-case comprising a cup-shaped base section having an axial arbor, 440 a cap-section havingaI circular end head and a tubular axial bobbin-supporting arbor, a latchllevcrrpivoted at a fixed point to said` cap-section. and releasably engaging said first-mentioned` arbor, and spring means to bias said latch- 45 vcr from open position to arbor-engaging posion. I

2. A sewing machine bobbin-case comprising a cup-shaped base section having an axial arbor, a cap-section having a circular end head and a 50 I tubular axial bobbin-supporting arbor, a latchpivoted at a fixedvpoint to said cap-section andi` releasably engaging said iirst-mentioned iv'axial arbor,- and spring means to biassaid latchlever freniv open position to arbor-engaging posi- 56 tion, said spring being letinto the end head of said cap-section.

3. A sewing machine bobbin-case comprising a cup-shaped base section having an axial arfbor, a l cap-section having a circular end head and a arbor-engaging position, and an arbor-pin for said torsion-spring.

4. A sewing machine bobbin-case comprising a cup-shapedbase section having an axial arbor, a cap-section having a circular end head and a tubular axial bobbin-supporting arbor, a latch- Alever pivoted to said cap-section and releasably engaging said "iirst mentioned axial arbor, a coiled Wire torsion-spring let into the end head of said cap-section to bias said latch-lever to arbor-engaging position, a-nd an arbor-pin for said torsion-spring disposed parallel to the end head of said cap-section. y

5. In a sewing machine bobbin-case having a cup-shaped base section With an axial arbor, a cap-section having a circular end head and a tubulary axial bobbin-supporting arbor, a latch-V lever pivoted to said cap-section and adapted to releasably engage said rst mentioned axial arbor, a coiled wire torsion-spring let into the end head of said cap-section to bias said latch-lever to arbor-engaging position, and a removable arbor-pin for said torsion-spring disposed parallel to the end head of said cap-section and having at its outer end a lateral extension facilitating itsv removal.

6. A bobbin-case cap-section having a circular end head formed with an aperture, a latch-lever amarre fulcrumed in said end head, ay spring arbor pin disposed within said aperture, and a coiled Wire torsion spring on said arbor-pin within said aperture, said spring having one end leg extended laterally of said spring coil and arranged to bear upon said latch-lever.

7. A bobbin-case cap-section having a circular end head formed with a recess in its outer face, a latch-lever fulcrumed in said end head, and a spring disposed in said recess and having an end arranged to bear upon said latch-lever in a direction transverse to the plane of said outer face.

8. A bobbin-case cap-section having a recessed circular end head and a tubular axial arbor, a

I latch-lever fulcrumed in said arbor and having an operating arm received in said recess when in closed position, and a biasing spring recessed into said end head and having an end leg arranged to bear upon, said operating arm in a direction toward said end head when said operating arm is in open position.

9. A sewing machine bobbin-case cap-section having a disk-like end hea-d and a tubular axial arbor normalto said end head, a latch-lever fulcrum-pin extending across said tubular arbor, a latch-lever fulcrumed on said pin, and a biasing spring bearing upon said* latch-lever and received in a recess in said end head.

10. A sewing machine bobbin-case cap-section having a disk-like end head formed with an aperture, a tubular axial arbor normal to said end head, a latch-lever fulcrum-pin extendingvacross said tubular arbor, a latch-,lever fulcrumed on said pin, and a coiled Wire torsion-springy having an extended end leg bearing upon said latchlever, vsaid spring being disposed in said aperture.

JOHN D. 

